Thatcher, I'm pretty sure it's the other way around, only S4/S6 rotors and not the 200q20v rotors. Nathan Engelbert 83 UrQ DA900453 89 90q 91 200q20v donor 91 200q20v avant > The way I understood it, you could use the calipers off either a 200 > 20v or an S4/S6, but the rotors from the S4/S6 would not work, only > the rotors off the 200. >